Improvement in locks



UNITED STATES PATENT OFFICE.

HENRY OAKS, OF WAYNESBOROUGH, PENNSYLVANIA.

IMPROVEMENT IN LOCKS.

To all whom it may concern:

Be it known that l, HENRY OAKS, of Waynesborough, in the county ot' Franklin and State of Pennsylvania, have made certain new and useful Improvements in Locks 5 and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the annexed drawings, making part of this specification, in which- Figure l is an elevation of the lock with the plate or lid of the box removed. Fig. 2 is a section on the line xx, Fig. 1. Fig. 3 is a seetion on the line y y, Fig. l. Figs. 4 and 5 are views of the key.

Similar letters of reference indicate corresponding parts in lhe several figures.

The object of my invention is to provide a lock especially adapted-in the form herein shown-to `fastening doors which open outwardly, such as barn, stable, and outhouse doors.

It consists of an arrangement of expanding jaws whose teeth act as detainers to the hooks on t-he sha-nks of the hasp, which incloses the bar which is aflixed to the door, the teeth of the jaws being unclasped by the rotation of a key, whose bits act upon two plates, one of each of which operate upon each of the jaws to cause them to release the hasp.

To enable others skilled in the art to which my invention relates to fully understand and use the same, I will proceed to describe its construction and operation.

A is the door, and B the door-post against which the door shuts. C is a bar, rigidly attached to-the door by the bolt D and other appropriate fastenings. The lock consists of the usual large plate E, the side plates, and the cap F, and attached to the larger plate and formin ga right angle therewith is a liangeplate, G, which fastens on that side of the door-post or scantling which faces outwardly. Pivoted on'the inside ot this lock are two pieces, J J', having shoulders or catches upon them, which engage wit-h the notches on the Shanks ot' the hasp I, which embraces the narrow portion D of the bar C, and, entering the hasp-orifices of the lock, is there detained When the door is locked. The hasp is loose and is pushed in by hand after the door is closed, forcing its way against the pressure of the sprirg K, which tends to expand the jaws J J until the notches'on the former having slipped past the teeth on the latter, the jaws suddenly-expand and the vertical faces ofthe projections on both are fairly engaged.`

So much for the locking and means for locking, which consists ot a hooked clevis embracing the bar ot' the door and retained in the lock by the toothed expanding-jaws. It is now necessary to describe the method of comnotched enlargement tothe circularhole,`

which approximately corresponds to the size of the shank Q, the end ot' which, when the key is thrust home, enters the stump N. The bit R of the lock at this time occupies a cavity in the bar L, to which the end of thejaw J is attached. At the same time the bit S lies in a cavity in the bar M, which is attached to the jaw J. The bars L and M are guided in their reciprocatory motion by the stumps N O, and

'as the key is turned over to the right the curved faces of the bits R S impinge upon the sides of the recess, in which they rotate and thrust the bar M downward, while the bar L is drawn up. The eftect of this motion is very apparent and is represented in Fig. Il, where the catches and notches are not quite withdrawn from engagement with `each other, while the india-rubber spring K is shown in its partially compressed state. As the bits R and S, in the revolution ot' the key, pr( ss upon the portions of the bars L M immediately exposed to them, the bars are moved to such an extent that the edges of the plates L M proy ject into the grooves b c of the key-shank and act to some extent as tumblers. The object of this arrangement is tocompel a certain degree of relative tting of the key to the lock and provide an additional safeguard against tampering with the lock with a `key not specially prepared. Y

The purpose of the bit T and its corresponding groove U in the plate P is to admit ot' a The notch v in nl@ plate P is for the pdr! pose of admitting the revolution of the bit R as the key is rotated to bring,` it round to the notch in the key-hole after the passage of the bits S and T out at the saine notch.

Having thus described my invention, the following is -What I claiin as new therein and desire to secure by Letters Patentl. The hooked detachable hasp I, in combination with the bar D, the expanding-jatvs4 J J', and spring K, substantially as and for tliepurpose described.

v 2. The combination of the expanding-jaws J J andV spring K with the drawing and thrusting` bars L M, operated, respectively, by the bits R S on the key, as described.

3. The key Q, with the operating bits R S, as described, and the supplementary safetybit T, located 'on the shank relatively to a notch in the side of the passage-Way occupied by the shank in unlocking' and affording a ineans of adapting each key to a specific lock, as described.

To the above specification of my improve ment in locks I have signed my hand this 1st day of' February, 1835.

HENRY OAKS.

Witnesses:

CHARLES D. SMITH, ALEX. A. 0.*KLAUCKE. 

